MPS-ATLAS: A fast all-in-one code for synthesising stellar spectra

Context. Stellar spectral synthesis is essential for various applications, ranging from determining stellar parameters to comprehensive variability calculations. New observational resources as well advanced atmosphere modelling, taking three dimensional effects radiative magnetohydrodynamics calculations into account, require a more efficient transfer. Aims. For accurate, fast and flexible of opacity distribution functions (ODFs), atmospheres, spectra, we developed an code building on the well-established ATLAS9 code. The new also paves way easy access different elemental compositions in Methods. generation ODF tables, further DFSYNTHE by implementing additional functionality speed-up employing parallel computation scheme. In addition, line lists used can be changed Kurucz’s recent lists. particular, implemented VALD3 list. Results. A code, Merged Parallelised Simplified ATLAS, presented. It combines ODF, local thermodynamic equilibrium, therefore being all-in-one This provides numerical substantially faster compared other available codes. fully portable MPS-ATLAS validated against previous calculations, PHOENIX high-quality observations.